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Old 05-13-2013, 08:28 PM
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Dual or Single Carb?

Hey guys, im in the process of building a 600 hp 496 stroker bbc, Im not sure if I should go with 1 big fat 4 barrel on a victor jr or 2 smaller ones on a tunnel ram, this is for a pro street pickup with 410s and 3500 rpm stall converter, please give me your input. I know the tunnel ram will be more work but damn they are cool looking!

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Old 05-13-2013, 09:12 PM
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"I know the tunnel ram will be more work but damn they are cool looking!"

Yup! Probably better streetability and horsepower with a large single four bbl carb.
But forty years ago I was running tunnel ram big blocks on the street and I intend on doing it again!!
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Old 05-13-2013, 09:17 PM
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run a single 950 holley HP. 600 hp is actually quite mild.If you run a tunnel ram,you will need 2 x 850 holley HP,that $600.00 dollars more that wont add much power to a 600 hp build.If you build an 800 hp 496,then the 2 x 4 bbls would likely add 50 hp
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Old 05-13-2013, 09:49 PM
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Depending on what your planning to do with it..I would slap a tunnel ram on it.. That's just me...

This was my 468..

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Old 05-14-2013, 08:28 AM
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Quote:
Originally Posted by tuff82 View Post
Hey guys, im in the process of building a 600 hp 496 stroker bbc, Im not sure if I should go with 1 big fat 4 barrel on a victor jr or 2 smaller ones on a tunnel ram, this is for a pro street pickup with 410s and 3500 rpm stall converter, please give me your input. I know the tunnel ram will be more work but damn they are cool looking!
Yea there is more to than just bolting them on and going that is where I have seen people get in over there heads..There is more cost and more tuning time with extra carb and linkage. Inline linkage is cheaper and easier vs the cross or sideways mount setup. I do not recommend progressive linkage on carbs, they should be setup in unison on TR. Also syncing them helps with idle/off idle quality. There is someone who still makes them for Holley's just don't remember who, or you could make your own. Would recommend a TR with longer smaller runners to keep velocity up. Also TR'Ss like alot of initial timing some even set them full.
My current setup is a bbc 427 with a pair on 650 double pumpers (I prefer DP'S) on an older weiand intake. Will be eventually try a larger pair of carbs some time. Older pic in avatar...

Last edited by 65 Imp SS; 05-14-2013 at 08:40 AM.
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Old 05-14-2013, 10:00 AM
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Found a more current pic:

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Old 05-14-2013, 10:19 AM
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With someone who is good at tuning carbs a tunnel ram will have no streetability problems, BUT the cost will always be there, by the time your done going with a tunnel ram will be close to a grand more. Its cool though.

Another option would be IR induction, but that is even more costly- though even more cool IMO.
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Old 05-14-2013, 01:48 PM
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From experrience with a tr on my flatbottom river runner boat= I had a 454 with offenhauser TR-have both tops- used dual 660hollys= for some years. always ran excellent. changed to a single top on the tr setup- installed a 780 holly- on top end only dropped 500 rpm=i was amazed! that little drop. fuel savings was amazing ill add!! Love the TR looks -yet=suer is a fuel & cost saver with 1 carb!!
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Old 05-18-2013, 09:30 PM
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What would be the advantages of running a single plane with 1 big fat carb instead, im looking for max power
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Old 05-19-2013, 01:48 AM
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496/600 hp

Quote:
Originally Posted by tuff82 View Post
What would be the advantages of running a single plane with 1 big fat carb instead, im looking for max power
600 hp is no where near max horse power.so why bother to run 2 carbs?
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Old 05-19-2013, 06:54 AM
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Originally Posted by vinniekq2 View Post
600 hp is no where near max horse power.so why bother to run 2 carbs?
Like anything power is relative, I try to get the most power out of any set up that I build, there is guys on here with a lot more knowledge than me, this is the strongest powerplant Ive ever built and would like to get as much power out of it.
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Old 05-19-2013, 06:59 AM
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Originally Posted by F-BIRD'88 View Post
there is no advantage.. The tunnel ram will make more power than a single manifold. It is the most powerfull manifold design there is for a V8
Well I thought so to but I read articles saying that it's 60's technology and a large single plane with 1 4 barrel will make more power, I need around 950 cfm.
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Old 05-19-2013, 09:23 AM
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950 cfm

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Originally Posted by tuff82 View Post
Well I thought so to but I read articles saying that it's 60's technology and a large single plane with 1 4 barrel will make more power, I need around 950 cfm.
post 3 I said use a single 950 cfm.
you can also check into the single barrel giants carbs? or a 1050? a hot street version of a 496 should be able to make 750 ish hp and be street able. That's a lot of HP and this engine will make some noise,,,,
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Old 05-19-2013, 08:37 PM
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Ok guys thanks for the info!
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Old 05-19-2013, 09:08 PM
How fast is fast enough?
 
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Quote:
Originally Posted by F-BIRD'88 View Post
there is no advantage.. The tunnel ram will make more power than a single manifold. It is the most powerfull manifold design there is for a V8
Except for a tuned IR system. Which is crazy expensive.

A single plane intake will be cheaper than a tunnel ram, that's the advantage.
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